Update Pandas DataFrame elements by column name

Purpose

I want to update the elements of DataFrame by specifying the column name

environment

OS:　ubuntu18.04 python version: 3.6.9

Source code

main.py

#!/usr/bin/env python3
import pandas as pd

if __name__ == '__main__':
    dic = {'key1':[1,2,3],'key2':[4,5,6],'key3':[7,8,9]}

    df = pd.DataFrame.from_dict(dic)

    print(df)

    df.iloc[-1, df.columns.get_loc('key2')] = 10 #Update the value of Key2 in the last line

    print(df)

result

   key1  key2  key3
0     1     4     7
1     2     5     8
2     3     6     9

   key1  key2  key3
0     1     4     7
1     2     5     8
2     3    10     9